fix search domains and remove username from magicdns (#1987)

hscontrol/mapper/mapper.go

@@ -122,37 +122,41 @@ func generateUserProfiles(
 }
 
 func generateDNSConfig(
-	base *tailcfg.DNSConfig,
+	cfg *types.Config,
 	baseDomain string,
 	node *types.Node,
 	peers types.Nodes,
 ) *tailcfg.DNSConfig {
-	dnsConfig := base.Clone()
+	if cfg.DNSConfig == nil {
+		return nil
+	}
+
+	dnsConfig := cfg.DNSConfig.Clone()
 
 	// if MagicDNS is enabled
-	if base != nil && base.Proxied {
-		// Only inject the Search Domain of the current user
-		// shared nodes should use their full FQDN
-		dnsConfig.Domains = append(
-			dnsConfig.Domains,
-			fmt.Sprintf(
-				"%s.%s",
-				node.User.Name,
-				baseDomain,
-			),
-		)
+	if dnsConfig.Proxied {
+		if cfg.DNSUserNameInMagicDNS {
+			// Only inject the Search Domain of the current user
+			// shared nodes should use their full FQDN
+			dnsConfig.Domains = append(
+				dnsConfig.Domains,
+				fmt.Sprintf(
+					"%s.%s",
+					node.User.Name,
+					baseDomain,
+				),
+			)
 
-		userSet := mapset.NewSet[types.User]()
-		userSet.Add(node.User)
-		for _, p := range peers {
-			userSet.Add(p.User)
+			userSet := mapset.NewSet[types.User]()
+			userSet.Add(node.User)
+			for _, p := range peers {
+				userSet.Add(p.User)
+			}
+			for _, user := range userSet.ToSlice() {
+				dnsRoute := fmt.Sprintf("%v.%v", user.Name, baseDomain)
+				dnsConfig.Routes[dnsRoute] = nil
+			}
 		}
-		for _, user := range userSet.ToSlice() {
-			dnsRoute := fmt.Sprintf("%v.%v", user.Name, baseDomain)
-			dnsConfig.Routes[dnsRoute] = nil
-		}
-	} else {
-		dnsConfig = base
 	}
 
 	addNextDNSMetadata(dnsConfig.Resolvers, node)
@@ -568,7 +572,7 @@ func appendPeerChanges(
 	profiles := generateUserProfiles(node, changed, cfg.BaseDomain)
 
 	dnsConfig := generateDNSConfig(
-		cfg.DNSConfig,
+		cfg,
 		cfg.BaseDomain,
 		node,
 		peers,

hscontrol/mapper/mapper_test.go

@@ -127,7 +127,10 @@ func TestDNSConfigMapResponse(t *testing.T) {
 			}
 
 			got := generateDNSConfig(
-				&dnsConfigOrig,
+				&types.Config{
+					DNSConfig:             &dnsConfigOrig,
+					DNSUserNameInMagicDNS: true,
+				},
 				baseDomain,
 				nodeInShared1,
 				peersOfNodeInShared1,
@@ -187,9 +190,9 @@ func Test_fullMapResponse(t *testing.T) {
 		UserID:     0,
 		User:       types.User{Name: "mini"},
 		ForcedTags: []string{},
-		AuthKey:     &types.PreAuthKey{},
-		LastSeen:    &lastSeen,
-		Expiry:      &expire,
+		AuthKey:    &types.PreAuthKey{},
+		LastSeen:   &lastSeen,
+		Expiry:     &expire,
 		Hostinfo:   &tailcfg.Hostinfo{},
 		Routes: []types.Route{
 			{

hscontrol/mapper/tail.go

@@ -77,7 +77,7 @@ func tailNode(
 		keyExpiry = time.Time{}
 	}
 
-	hostname, err := node.GetFQDN(cfg.DNSConfig, cfg.BaseDomain)
+	hostname, err := node.GetFQDN(cfg, cfg.BaseDomain)
 	if err != nil {
 		return nil, fmt.Errorf("tailNode, failed to create FQDN: %s", err)
 	}